It's certainly not straightforward. You know how 90% of crashes occur within whatever many miles of home? People don't use autopilot while they're cruising around their suburbs or cities.
Companies would have to disclose not just their accidents, but also how much driving is done in different places. Then all those places would have to be compared or at least categorized. Its complex enough that there would definitely not be a straightforward, obviously-correct way to interpret it all.
Since companies do not disclose where self-driving occurs, the whole thing is a complete nonstarter. It's whatever they choose to disclose.
